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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2008 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2008 Craig Edwards <craigedwards@brainbox.cc>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "commands.h"
#include "treeserver.h"
#include "treesocket.h"
/** FJOIN, almost identical to TS6 SJOIN, except for nicklist handling. */
CmdResult CommandFJoin::Handle(User* srcuser, std::vector<std::string>& params)
{
/* 1.1+ FJOIN works as follows:
*
* Each FJOIN is sent along with a timestamp, and the side with the lowest
* timestamp 'wins'. From this point on we will refer to this side as the
* winner. The side with the higher timestamp loses, from this point on we
* will call this side the loser or losing side. This should be familiar to
* anyone who's dealt with dreamforge or TS6 before.
*
* When two sides of a split heal and this occurs, the following things
* will happen:
*
* If the timestamps are exactly equal, both sides merge their privilages
* and users, as in InspIRCd 1.0 and ircd2.8. The channels have not been
* re-created during a split, this is safe to do.
*
* If the timestamps are NOT equal, the losing side removes all of its
* modes from the channel, before introducing new users into the channel
* which are listed in the FJOIN command's parameters. The losing side then
* LOWERS its timestamp value of the channel to match that of the winning
* side, and the modes of the users of the winning side are merged in with
* the losing side.
*
* The winning side on the other hand will ignore all user modes from the
* losing side, so only its own modes get applied. Life is simple for those
* who succeed at internets. :-)
*
* Syntax:
* :<sid> FJOIN <chan> <TS> <modes> :[[modes,]<uuid> [[modes,]<uuid> ... ]]
* The last parameter is a list consisting of zero or more (modelist, uuid)
* pairs (permanent channels may have zero users). The mode list for each
* user is a concatenation of the mode letters the user has on the channel
* (e.g.: "ov" if the user is opped and voiced). The order of the mode letters
* are not important but if a server ecounters an unknown mode letter, it will
* drop the link to avoid desync.
*
* InspIRCd 2.0 and older required a comma before the uuid even if the user
* had no prefix modes on the channel, InspIRCd 2.2 and later does not require
* a comma in this case anymore.
*
*/
time_t TS = ConvToInt(params[1]);
if (!TS)
{
ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "*** BUG? *** TS of 0 sent to FJOIN. Are some services authors smoking craq, or is it 1970 again?. Dropped.");
ServerInstance->SNO->WriteToSnoMask('d', "WARNING: The server %s is sending FJOIN with a TS of zero. Total craq. Command was dropped.", srcuser->server->GetName().c_str());
return CMD_INVALID;
}
const std::string& channel = params[0];
Channel* chan = ServerInstance->FindChan(channel);
bool apply_other_sides_modes = true;
if (!chan)
{
chan = new Channel(channel, TS);
}
else
{
time_t ourTS = chan->age;
if (TS != ourTS)
{
ServerInstance->SNO->WriteToSnoMask('d', "Merge FJOIN received for %s, ourTS: %lu, TS: %lu, difference: %lu",
chan->name.c_str(), (unsigned long)ourTS, (unsigned long)TS, (unsigned long)(ourTS - TS));
/* If our TS is less than theirs, we dont accept their modes */
if (ourTS < TS)
{
apply_other_sides_modes = false;
}
else if (ourTS > TS)
{
// Our TS is greater than theirs, remove all modes, extensions, etc. from the channel
LowerTS(chan, TS, channel);
// XXX: If the channel does not exist in the chan hash at this point, create it so the remote modes can be applied on it.
// This happens to 0-user permanent channels on the losing side, because those are removed (from the chan hash, then
// deleted later) as soon as the permchan mode is removed from them.
if (ServerInstance->FindChan(channel) == NULL)
{
chan = new Channel(channel, TS);
}
}
}
}
/* First up, apply their channel modes if they won the TS war */
if (apply_other_sides_modes)
{
// Need to use a modestacker here due to maxmodes
irc::modestacker stack(true);
std::vector<std::string>::const_iterator paramit = params.begin() + 3;
const std::vector<std::string>::const_iterator lastparamit = ((params.size() > 3) ? (params.end() - 1) : params.end());
for (std::string::const_iterator i = params[2].begin(); i != params[2].end(); ++i)
{
ModeHandler* mh = ServerInstance->Modes->FindMode(*i, MODETYPE_CHANNEL);
if (!mh)
continue;
std::string modeparam;
if ((paramit != lastparamit) && (mh->GetNumParams(true)))
{
modeparam = *paramit;
++paramit;
}
stack.Push(*i, modeparam);
}
std::vector<std::string> modelist;
// Mode parser needs to know what channel to act on.
modelist.push_back(params[0]);
while (stack.GetStackedLine(modelist))
{
ServerInstance->Modes->Process(modelist, srcuser, ModeParser::MODE_LOCALONLY | ModeParser::MODE_MERGE);
modelist.erase(modelist.begin() + 1, modelist.end());
}
}
irc::modestacker modestack(true);
TreeSocket* src_socket = TreeServer::Get(srcuser)->GetSocket();
/* Now, process every 'modes,uuid' pair */
irc::tokenstream users(*params.rbegin());
std::string item;
irc::modestacker* modestackptr = (apply_other_sides_modes ? &modestack : NULL);
while (users.GetToken(item))
{
ProcessModeUUIDPair(item, src_socket, chan, modestackptr);
}
/* Flush mode stacker if we lost the FJOIN or had equal TS */
if (apply_other_sides_modes)
CommandFJoin::ApplyModeStack(srcuser, chan, modestack);
return CMD_SUCCESS;
}
void CommandFJoin::ProcessModeUUIDPair(const std::string& item, TreeSocket* src_socket, Channel* chan, irc::modestacker* modestack)
{
std::string::size_type comma = item.find(',');
// Comma not required anymore if the user has no modes
std::string uuid = ((comma == std::string::npos) ? item : item.substr(comma+1));
User* who = ServerInstance->FindUUID(uuid);
if (!who)
{
// Probably KILLed, ignore
return;
}
/* Check that the user's 'direction' is correct */
TreeServer* route_back_again = TreeServer::Get(who);
if (route_back_again->GetSocket() != src_socket)
{
return;
}
/* Check if the user received at least one mode */
if ((modestack) && (comma > 0) && (comma != std::string::npos))
{
/* Iterate through the modes and see if they are valid here, if so, apply */
std::string::const_iterator commait = item.begin()+comma;
for (std::string::const_iterator i = item.begin(); i != commait; ++i)
{
if (!ServerInstance->Modes->FindMode(*i, MODETYPE_CHANNEL))
throw ProtocolException("Unrecognised mode '" + std::string(1, *i) + "'");
/* Add any modes this user had to the mode stack */
modestack->Push(*i, who->nick);
}
}
chan->ForceJoin(who, NULL, route_back_again->bursting);
}
void CommandFJoin::RemoveStatus(Channel* c)
{
irc::modestacker stack(false);
const ModeParser::ModeHandlerMap& mhs = ServerInstance->Modes->GetModes(MODETYPE_CHANNEL);
for (ModeParser::ModeHandlerMap::const_iterator i = mhs.begin(); i != mhs.end(); ++i)
{
ModeHandler* mh = i->second;
/* Passing a pointer to a modestacker here causes the mode to be put onto the mode stack,
* rather than applied immediately. Module unloads require this to be done immediately,
* for this function we require tidyness instead. Fixes bug #493
*/
mh->RemoveMode(c, stack);
}
ApplyModeStack(ServerInstance->FakeClient, c, stack);
}
void CommandFJoin::ApplyModeStack(User* srcuser, Channel* c, irc::modestacker& stack)
{
parameterlist stackresult;
stackresult.push_back(c->name);
while (stack.GetStackedLine(stackresult))
{
ServerInstance->Modes->Process(stackresult, srcuser, ModeParser::MODE_LOCALONLY);
stackresult.erase(stackresult.begin() + 1, stackresult.end());
}
}
void CommandFJoin::LowerTS(Channel* chan, time_t TS, const std::string& newname)
{
if (Utils->AnnounceTSChange)
chan->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :TS for %s changed from %lu to %lu", chan->name.c_str(), newname.c_str(), (unsigned long) chan->age, (unsigned long) TS);
// While the name is equal in case-insensitive compare, it might differ in case; use the remote version
chan->name = newname;
chan->age = TS;
// Remove all pending invites
chan->ClearInvites();
// Clear all modes
CommandFJoin::RemoveStatus(chan);
// Unset all extensions
chan->FreeAllExtItems();
// Clear the topic, if it isn't empty then send a topic change message to local users
if (!chan->topic.empty())
{
chan->topic.clear();
chan->WriteChannelWithServ(ServerInstance->Config->ServerName, "TOPIC %s :", chan->name.c_str());
}
chan->setby.clear();
chan->topicset = 0;
}
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